how about their security ? (i’m a big fan of particular models of the world (ingame too) and the more details the better 
). is it conceivable that they might have security problems (like a core melt-down if you don’t maintain it) ? this could be a great place where a giant Titan appears because he was lured from the - radioactive - fallout and will repair / re-nature the area and protect it.
how is the energy output of them ? can 1 power core run “everything” you connect to them or do we need a lot of cores for a lot of tools ? if we need a lot of cores (because they only produce a limited amount of energy) is it possible to build a power plant and transmit the ernergy (over wires) to remote locations ? (similar to the modern energy grid)